#190 

HI Tony Thank you very much for the information/explanation. I followed your instruction on my 2020 version BG7TBL GPSDO and now have GLONASS and Gallileo working as well! Brilliant.

Thank you Tony for a really interesting video! Next time you have your GPSDO connected to the computer check out the "TP5" configuration menu. With it you can program the 1 PPS output to most any frequency you want from 48 MHz (the internal TCXO frequency) down to 1 Hz - with variable duty cycle. Just be aware that frequencies that are not even multiples of 2 will have what looks like phase jitter caused by the firmware/hardware frequency divider (i.e. 12 MHz looks stable, 10 MHz has "jitter")

Thanks for sharing your knowledge, providing the zip file, and the very clear directions. The upgrade worked a treat! GPS + GLONASS + Galileo all active now! Dank je wel and 73!

Hi Tony Greetings from Canada I recently just starting watch your videos, and really enjoy them Keep up the good work brother

Good morning Tony. Thank you for your clear instructions. It worked quite well for me as well. Cool!! So many new satellites showing up here in California, USA. Keep up the good work!

I've been doing some experiments with my BG7TBL (which I've upgraded to have a UBLOX Neo-9 receiver.) Turning on additional GNSS satellite systems can add better *position* accuracy, but the 1 PPS clock output used to discipline the oscillator uses only ONE system - according to the manual. The system used can be chosen in U-center. Alternatively, one can set the time pulse time-base to "UTC time" which will automatically select a GNSS system to use. It does so preferentially though, with GPS being the first choice. So there isn't any accuracy gain there. There's another issue with setting it to UTC time though. More 1 PPS jitter: as much as 5 times more in practice! I can see this on the 1 PPS output pin on the UBLOX. Another unrelated observation: the 1 PPS output on the BG7TBL does not appear to come from the UBLOX 1 PPS output! If I inhibit the 1 PPS output on the UBLOX, the BG7TBL 1 PPS output still runs! The good news is the discipline does appear to use the UBLOX output though. The 1 PPS output appears to come from the FPGA, triggered by the data stream from the UBLOX! So, I think ever trying to correlate, with any degree of accuracy, the 1 PPS output and the 10 MHz output's phase relationship or jitter may yield disappointing results.

Hi Tony, Thank you for your finding and sharing.

Just watched this video and immediately subscribed. Greetings from Canada!

Thank you for the really interesting video, and included links Tony !

Thanks for the video and files. I just did this with my new BG7TBL with no display and it worked great.

That was very interesting for me Tony. I have the BG7TBL and would love to try the same. Need to find a RS232 lead first. Your best video so far!

Thanks for sharing this info. Just got mine, trying it today Best 73

Excellent. Very interesting and informative :)

Great info! Thanks for sharing.

Hi Tony, great video, I found it very interesting. Can you recommend where to buy a BG7TBL or a certain seller? I'm torn between a version of the BG7TBL GPSDO or the Leo Bodnar Precision GPS Reference Clock (But this does not have a OCXO)

Tony, it appears you caught a satellite on camera. Watch the window at 7:10 in your video. You can even see the albedo change.

Hi Tony, I watched a video where 2 units were combined with a GPS specific hub with DC block. To add, a commenter suggested that a satellite hub with DC block could be used. This way, 2 receivers can be used with one antenna. Would it be possible to use 2 stand-alone receivers and 2 antennas separately and just combine the outputs with diodes to block from feedback, or would an imbalance at the same frequency take place?? BTW the GPS hub I found was expensive.......$275 USD 😳 Great video👍👍

Thanks for your explanation. Can you tell how to see the gpsdo when it is connected to a B210?

Tony, I have a question: recently I get my gpsdo and my eight-port distribution amplifier, and manage to put both boards in a single box. But the voltage regulator in the amp board always is quite hot, and makes the whole box quite hot as well. When the gpsdo’s was the only board in the box, it gets no temperature at all. So maybe I must undo the unit’s mix for safe ocxo operation? You think that higher temperatures affects the ocxo or the gps chip?

The GPSDO I ordered came from Aliexpress today but it's rather disappointing. On the display it just says 10.000 Mhz GPSDO for a while then changes to say PPB -2.3 and PWM31077 but there are no instructions at all so I have no idea what that means. Pushing in the knob gets into a menu where I can select Contrast, Offset, PWM Set and Exit but that's all. It never displays the time like they show in some photos and there's no way to even tell if it's picking up any satellites or working at all! I opened it up and inside it has an Arduino Nano and NEO-6M module plugged into the main board with just it's 5 pins holding it. The main board also has a 10.000 Mhz OSCO on it and outputs on the back for 1PPM and 10 Mhz.. With the top off I can at least see the LED blinking on the NEO-6M so I guess it's working to some extent but they should have put the LED on the front.

I had the following email from the designer fyi: hello: can you used u-center to see the gps module type,if is ublox-7,can not change ,if is U8, CAN CHANGE TO GAL OR GLANASS.. THANKS BG7TBL

Tony I just installed u-center 23.3. I have the the same GPSDO you have. I'm using a USB to Serial cable. I believe that there must be some setting to tell the software how its connected to BG7TBL. Right now, U-Center software is not reading the data. Any suggestions?

What GPSDO with Display and OCXO would you recommend buying right now?

Тони, привет!

🎖🎖🎖🎖🎖

Hi Tony, I recently purchased the GPSDO looking like your black one. I will play with the software now I located the later versions. The manual state the 10MHz output can be sine or square wave. Mine is set to Sine. Do you know how to change it with programming to square wave output ? Is there a PC program to configure these units?. Your video was an enlightening into configuring to multiple systems. I am yet to discover what mine was set to in 2023 :)

What if the GPS unit is one of the smaller ones that doesn't have a serial output, can you still connect to the uBlox receiver inside it?

mine wont accept any send command just refreshes and goes back to old. my nmea is only 2.1 :(

hello can i install and activate gps on a hackrf one?